Debug through LwjglNativesLoader and see if it extracts the OpenAL lib and sets the system property correctly. If it does, I don't know why LWJGL can't find it. libgdx just updated LWJGL to the latest.

Ehm, 7 hours before you started name calling I told you how to debug the issue. Needless to say I am not inclined to help you further. Pro tip: people that could help you are not required to care about your problems. It is actually much easier not to care.https://code.google.com/p/libgdx/wiki/GettingHelp#Attitude

Not abuse if you try to find the answer first. Anyways, with libgdx you can either choose to make your own collision system, or go with box2d, which is a popular 2d physics library originating from C++ (ships with libgdx). If you're going to use that I would also recommend Aurelien Ribon's Physics Body Editor that allows you to make more complex shapes easily in box2d.

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